:root {
  --bg: #1e1e1e;
  --bg-2: #262626;
  --bg-3: #2e2e2e;
  --text: #f5f5f5;
  --muted: #b5b5b5;
  --line: #3a3a3a;
  --accent: #ffffff;
  --accent-ink: #141414;
  --accent-soft: rgba(255,255,255,.08);
  --gold: #e8b54a;
  --max: 1140px;
  --radius: 14px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 22px; }

/* Header */
header { position: sticky; top: 0; z-index: 50; background: rgba(30,30,30,.94); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; gap: 22px; height: 70px; }
.logo { height: 42px; }
.nav-links { display: flex; gap: 18px; margin-left: auto; font-size: 14px; color: #d6d6d6; }
.nav-links a { padding: 6px 2px; border-bottom: 2px solid transparent; }
.nav-links a:hover { color: #fff; border-bottom-color: var(--gold); }
.phone { font-weight: 700; white-space: nowrap; letter-spacing: .2px; }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  font-weight: 700; padding: 12px 24px; border-radius: 8px; font-size: 14px;
  border: none; cursor: pointer; white-space: nowrap; transition: transform .12s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(0,0,0,.35); }
.btn.ghost { background: transparent; color: #fff; border: 1px solid #555; }
.btn.gold { background: var(--gold); color: #1a1a1a; }

/* Hero */
.hero { position: relative; background: radial-gradient(1200px 600px at 80% -10%, #2c2c2c 0%, #111 55%); overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: 1.08fr .92fr; gap: 44px; align-items: center; padding-top: 72px; padding-bottom: 72px; }
.eyebrow { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--gold); margin-bottom: 14px; }
.hero h1 { font-size: 46px; line-height: 1.12; margin-bottom: 18px; font-weight: 800; letter-spacing: -.5px; }
.hero h1 .hl { color: var(--gold); }
.hero .sub { font-size: 18px; color: #ccc; margin-bottom: 26px; max-width: 46ch; }
.hero .tags { color: var(--muted); font-size: 14px; margin-bottom: 30px; letter-spacing: .4px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .media { position: relative; }
.hero .media img { border-radius: 16px; box-shadow: 0 24px 60px rgba(0,0,0,.5); }
.stat-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; background: var(--bg-2); border-top: 1px solid var(--line); }
.stat { padding: 22px; text-align: center; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat .n { font-size: 26px; font-weight: 800; color: var(--gold); }
.stat .l { font-size: 13px; color: var(--muted); }

/* Sections */
section { padding: 72px 0; }
.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head .kicker { font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--gold); margin-bottom: 10px; }
.sec-head h2 { font-size: 32px; font-weight: 800; margin-bottom: 10px; letter-spacing: -.3px; }
.sec-head p { color: var(--muted); max-width: 620px; margin: 0 auto; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card { background: var(--bg-2); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); transition: transform .18s ease, border-color .18s ease; }
.card:hover { transform: translateY(-4px); border-color: #555; }
.card img { aspect-ratio: 16/9; object-fit: cover; width: 100%; }
.card .body { padding: 24px; }
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card .num { font-family: ui-monospace, monospace; font-size: 12px; color: var(--gold); font-weight: 700; letter-spacing: 1px; }

/* Brands */
.brands { display: flex; flex-wrap: wrap; gap: 28px; align-items: center; justify-content: center; }
.brand-pill { display: flex; align-items: center; height: 64px; padding: 0 22px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; }
.brand-pill img { height: 30px; width: auto; filter: grayscale(1) brightness(0) invert(1); opacity: .9; }

/* FAQ */
.faq { max-width: 780px; margin: 0 auto; }
details { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px; overflow: hidden; }
summary { padding: 18px 22px; cursor: pointer; font-weight: 600; list-style: none; position: relative; }
summary::after { content: "+"; position: absolute; right: 22px; top: 14px; font-size: 22px; color: var(--gold); }
details[open] summary::after { content: "\2212"; }
details p { padding: 0 22px 20px; color: var(--muted); font-size: 15px; }

/* Testimonials */
.testi { text-align: center; padding: 8px 4px; }
.testi .stars { color: var(--gold); font-size: 18px; letter-spacing: 3px; margin-bottom: 12px; }
.testi .quote { font-size: 19px; font-style: italic; margin-bottom: 10px; color: #e8e8e8; }
.testi .who { color: var(--muted); font-size: 14px; }

/* Contact / footer */
.contact { background: #161616; border-top: 1px solid var(--line); }
.contact .wrap { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 36px; }
.contact h3 { font-size: 15px; margin-bottom: 14px; text-transform: uppercase; letter-spacing: 1px; color: #ccc; }
.contact li { list-style: none; color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.contact a:hover { color: #fff; }
footer { background: #111; border-top: 1px solid #2a2a2a; padding: 22px 0; font-size: 13px; color: #777; text-align: center; }

/* Page hero (interior) */
.page-hero { background: radial-gradient(900px 420px at 70% -20%, #2c2c2c 0%, #111 55%); border-bottom: 1px solid var(--line); }
.page-hero .wrap { padding-top: 56px; padding-bottom: 40px; }
.page-hero h1 { font-size: 38px; font-weight: 800; letter-spacing: -.4px; margin-bottom: 12px; }
.page-hero p { color: var(--muted); max-width: 720px; font-size: 16px; }
.crumb { font-size: 13px; color: #888; margin-bottom: 14px; }
.crumb a:hover { color: #fff; }

/* Calculator */
.calc-card { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; max-width: 760px; margin: 0 auto; }
.field { margin-bottom: 22px; }
.field label { display: block; font-size: 14px; font-weight: 600; color: #ccc; margin-bottom: 10px; }
.field .hint { font-size: 12.5px; color: #888; font-weight: 400; }
.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
input[type=number] {
  width: 100%; padding: 13px 15px; border: 1px solid #444; border-radius: 8px;
  background: var(--bg); color: #fff; font-size: 16px; font-family: inherit;
}
input[type=number]:focus { outline: none; border-color: var(--gold); }
.slider { width: 100%; -webkit-appearance: none; appearance: none; height: 8px; border-radius: 4px; background: #444; outline: none; }
.slider::-webkit-slider-thumb { -webkit-appearance: none; width: 24px; height: 24px; border-radius: 50%; background: var(--gold); border: 3px solid #fff; cursor: pointer; }
.slider::-moz-range-thumb { width: 24px; height: 24px; border-radius: 50%; background: var(--gold); border: 3px solid #fff; cursor: pointer; }
.result { background: linear-gradient(135deg, #2b2b2b 0%, #1f1f1f 100%); border: 1px solid var(--line); border-radius: var(--radius); padding: 36px; text-align: center; margin-top: 26px; }
.result .size { font-size: 76px; font-weight: 800; line-height: 1; color: var(--gold); letter-spacing: -2px; }
.result .label { font-size: 14px; color: var(--muted); text-transform: uppercase; letter-spacing: 2px; margin-top: 8px; }
.result .range { font-size: 15px; color: #ccc; margin-top: 16px; }
.result .specs { display: flex; justify-content: center; gap: 36px; margin-top: 22px; flex-wrap: wrap; }
.result .spec .v { font-size: 20px; font-weight: 700; color: #fff; }
.result .spec .k { font-size: 12px; color: #888; text-transform: uppercase; letter-spacing: 1px; }
.result .tip { margin-top: 24px; padding: 16px 20px; background: rgba(232,181,74,.08); border-left: 3px solid var(--gold); border-radius: 6px; font-size: 14px; color: #d6d6d6; text-align: left; }
.reftable { max-width: 860px; margin: 40px auto 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.reftable .row { display: grid; grid-template-columns: 1fr 1.4fr 1.2fr; padding: 13px 20px; border-bottom: 1px solid var(--line); font-size: 14px; }
.reftable .row:last-child { border-bottom: 0; }
.reftable .head { background: var(--bg-3); font-weight: 700; color: #ccc; text-transform: uppercase; letter-spacing: .6px; font-size: 12px; }
.reftable .row .b { color: #fff; font-weight: 600; }
.reftable .row .m { color: var(--muted); }

@media (max-width: 880px) {
  .nav-links { display: none; }
  .hero .wrap { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .contact .wrap { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .stat-strip { grid-template-columns: 1fr; }
  .stat { border-right: 0; border-bottom: 1px solid var(--line); }
  .input-row { grid-template-columns: 1fr; }
  .reftable .row { grid-template-columns: 1fr; gap: 4px; }
}